JP2011117162A - Film for light shielding window - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light shielding film which permits photovoltaic power generation while causing neither a rise in indoor temperature nor an increase in the greenhouse effect as a result of not impeding a decrease in the indoor temperature rise and greenhouse effect by a light shielding function due to the light shielding film bearing heat or storing heat by absorbing light and heat when the light shielding film is used stuck to window glass or door glass to shield incident light such as sunlight to the indoors from the outdoors. <P>SOLUTION: The light shielding film includes a photovoltaic generating layer 4 on one surface of a base film 2; a large number of regular fine light non-transmitting dot parts 3 on the photovoltaic generating layer 4 or on the other surface of the base film 2; and light reflecting dots 3a on at least the surfaces of the light non-transmitting dot parts 3. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention shields incident light such as sunlight from the outside to indoors by sticking it on the glass surface on the indoor side of glass plates such as window glass and door glass of residential houses and commercial and industrial buildings, and The present invention relates to a light-shielding window film capable of reducing the rise and the greenhouse effect and generating power using sunlight.

  In general, as a window film for shielding outside light such as sunlight by being attached to a glass surface of a window glass or door glass of a building, synthetic resins of various colors such as a dark color system described in Patent Document 1 On dark and colored film such as screen door film with air permeability and translucency that weaves warp and weft of metal etc. in a lattice shape, translucent polarizing film, and translucent film surface There is a light-shielding film such as a gradient film in which dark-colored opaque fine halftone dots having a predetermined aperture ratio are arranged.

  Window glass and door glass with such a light-shielding film on the glass surface have functions of translucency and light-shielding of outside light such as sunlight from the outside to the inside, and a moderate indoor concealment property against the outdoors. Function and can reduce indoor temperature rise and greenhouse effect.

  By the way, among such conventional light-shielding films, a light-shielding film having a dark color tone such as black or a light-shielding film having a low light reflectance is a light-shielding film having a light color tone such as white or a light reflectance film. Compared to a low light-shielding film, it has a high heat absorbability from the ultraviolet light region to the visible light region, and the heat conductivity is relatively high depending on the material of the film.

  Therefore, especially when using a light-shielding film with a dark color tone or a light-shielding film with low light reflectivity on a window glass or door glass, the light-shielding film attached to the glass surface absorbs light heat. In some cases, heat is generated or stored, thereby hindering the increase in indoor temperature and the reduction of the greenhouse effect due to the light shielding function, resulting in an increase in indoor temperature and an increase in the greenhouse effect.

JP-A-7-217341

  The problem of the present invention is that when a light-shielding film is attached to a window glass or a door glass in order to shield incident light such as sunlight from the outside to the indoor, the light-shielding film is heated by absorption of light heat. A light-shielding film that does not cause an increase in indoor temperature or an increase in the greenhouse effect without obstructing an increase in indoor temperature or a reduction in the greenhouse effect due to the light-shielding function. It is providing the light-shielding film which enables the electric power generation using sunlight while providing.

  The invention according to claim 1 of the present invention includes a photovoltaic generation layer 4 on one surface of a transparent or translucent substrate film 2, and is provided on the photovoltaic generation layer 4 or the other surface of the substrate film 2. Further, the light-shielding window film is characterized by comprising a large number of regularly opaque opaque dot portions 3 and at least the surface of the opaque opaque dot portions 3 provided with a light reflection halftone dot 3a. .

  The invention according to claim 2 of the present invention is provided with a photovoltaic generation layer 4 on one surface of a transparent or translucent substrate film 2, and on the photovoltaic generation layer 4 or the other surface of the substrate film 2. In addition, a large number of regularly opaque translucent halftone dots 3 are provided, at least on the surface of the opaque translucent halftone dots 3, a light reflecting halftone dot 3 a is provided. The light-shielding window film is characterized by having an opaque net 3b at a position facing the point 3a.

  The invention according to claim 3 of the present invention is the light-shielding window film according to claim 1 or 2, wherein the photovoltaic generation layer 4 is a light-transmitting layer, and is solid on one surface of the substrate film 2. It is the film for light-shielding windows characterized by being formed in the shape.

  The invention according to claim 4 of the present invention is the light-shielding window film according to claim 1 or 2, wherein the photovoltaic generation layer 4 is a light-impermeable layer, and is one side of the base film 2. Further, the light-shielding window film is characterized in that it is formed in a continuous pattern shape with a total formation pattern area larger than the total formation pattern area of the light-transmitting halftone dots 3.

  According to a fifth aspect of the present invention, in the light-shielding window film according to any one of the first to fourth aspects, an adhesive layer 5 is laminated on the outermost surface on one side or the other side. It is the film for light-shielding windows characterized by having.

  The invention according to claim 6 of the present invention is the light-shielding window film according to any one of claims 1 to 5, wherein the light-reflective halftone dot 3 a of the light-impermeable halftone dot portion 3, and / or The light-shielding window film is characterized in that the non-transparent halftone dot 3b is provided in a single layer or two or more layers.

  The invention according to claim 7 of the present invention is the light-shielding window film according to any one of claims 1 to 6, wherein the light-receiving surface of the light-reflecting halftone dot 3a of the non-transparent halftone dot portion 3 is provided. The light-shielding window film is a light diffusing surface or a smooth mirror surface.

  The invention according to claim 8 of the present invention is the light-shielding window film according to any one of claims 1 to 7, wherein the light-reflective halftone dot 3 a of the light-opaque halftone dot part 3 and the light-impermeable light. The light shielding window film is characterized in that the halftone dots 3b are turtle shell (hexagonal, honeycomb) shaped halftone dots.

  The light-shielding window film of the present invention is provided with a large number of regularly light-impermeable halftone dots (or fine light-impermeable halftone dots) on one side, and the light-opaque halftone dots are light reflecting nets. Since the point 3a is provided and the surface of the light reflection halftone dot is provided with a light reflecting surface, the light shielding window film of the present invention is not used for blocking incident light such as sunlight from the outside to the inside. When the reflective surface of the light-transmitting halftone dot of the light-transmitting halftone dot is directed to the outdoor side and pasted on a window glass or door glass, the external light incident on the indoor side from the outdoor side is not transparent. The light can be reflected in the outdoor direction by the light reflection halftone dot 3 a of the halftone dot portion 3.

  Therefore, it is possible to suppress heat transfer and heat absorption of light heat caused by external light incident on the glass surface from the outdoor side to the glass surface from the light reflection halftone dot 3a, and a window glass or door glass band with a light-shielding window film attached thereto. The amount of heat and the amount of heat storage can be suppressed. The light-shielding property affixed to the glass by making the light reflection halftone dot 3a having a particularly smooth specular reflection surface into a light diffusing (or irregular light scattering) surface with fine irregularities such as a satin-like shape or a grainy shape. The glare of reflected light in the outdoor direction due to the window film can be eliminated.

In addition, the light-transmitting halftone dots 3 (light reflection halftone dots 3a, light-transmitting halftone dots 3b) are regularly arranged so that there is a gap between them, so that the scenery outside the window can be visually confirmed through the gap. In particular, when the halftone dot 3 is a tortoiseshell pattern (hexagonal), a honeycomb-like halftone dot, etc. Therefore, the pattern arrangement density can be increased, the area of the light transmission part (light transmission part) can be reduced, and the light shielding property can be improved.

  As described above, the light-shielding window film of the present invention can shield incident light such as sunlight from the outside to the indoor, and the indoor temperature rise or greenhouse generated by the light-shielding function of the conventional light-shielding film. It is an excellent light-shielding film that eliminates the hindrance to the reduction of the effect and can shield the light without increasing the indoor temperature or increasing the greenhouse effect, and can be used as a multi-purpose light-shielding film other than the film for windows. The same excellent effect as that of a window film can be obtained.

  In addition, the light-shielding window film of the present invention generates an electromotive force by sunlight in an appropriate pattern such as a whole surface or a halftone dot on one surface of the base film 2 provided with the non-transparent halftone dot portion 3. Since the photovoltaic generation layer 4 is provided, the light-impermeable halftone dot portion 3 provided with the light reflection halftone dot 3a blocks incident light such as sunlight from the outdoors to reflect it in the outdoor direction. It is possible to eliminate the increase in indoor temperature and the reduction of the greenhouse effect, and can block light without causing an increase in the indoor temperature or increase in the greenhouse effect, and is present in a region where the opaque net portion 3 is not formed. The photovoltaic generation layer 4 is an excellent light-shielding film capable of receiving sunlight and generating electric power, and can obtain an excellent effect as a light-shielding film for multi-purpose solar power generation other than a window film. It can be done.

The front view explaining an example of the film for light-shielding windows of this invention. (A)-(c) is a sectional side view explaining each example of the film for light-shielding windows of this invention. (A)-(d) is a partial expanded side sectional view explaining each example of the film for light-shielding windows of this invention. (A)-(b) is a sectional side view explaining the usage example of the film for light-shielding windows of this invention. (A)-(b) is a partial expanded side sectional view of the usage example of the film for light-shielding windows of this invention. (A) is the partial front view explaining the translucent halftone dot part by the turtle shell pattern of the film for light-shielding windows of this invention, (b) is the partial side view.

  The light-shielding window film according to claim 1 of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a plan view illustrating an embodiment of the light-shielding window film 1 of the present invention. 2A to 2C are side views of the XX, 2 is a transparent or translucent substrate film, and 3 is a light-transmitting halftone dot.

  As shown in FIG. 2 (a), the light-shielding window film 1 of the present invention is a translucent layer (transparent layer) on one surface of a transparent or translucent substrate film 2, and solar power generation is performed. The photovoltaic generation layer 4 composed of possible np-coupled semiconductor cells is provided in a solid shape, and the photovoltaic generation layer 4 is provided with a large number of regularly opaque opaque dot portions 3. A light reflection halftone dot 3 a is provided on the surface of the translucent halftone dot portion 3.

Alternatively, although not shown, the other surface of the base film 2 that does not include the photovoltaic generation layer 4 shown in FIG. A light reflecting halftone dot 3 a may be provided on the surface of the non-transparent halftone dot portion 3.

  Further, as shown in FIG. 2B, the light-shielding window film 1 of the present invention is composed of an np-coupled semiconductor cell capable of photovoltaic power generation on one surface of a transparent or translucent base film 2. A photovoltaic generation layer 4 is provided, and the photovoltaic generation layer 4 is regularly provided with a large number of opaque opaque dot portions 3, and the opaque opaque dot portions 3 are formed on the surface thereof. A light reflection halftone dot 3a is provided.

  And the said light-impermeable halftone dot part 3 is equipped with the light-transmissive halftone dot 3b in the position which aligns and opposes this light reflection halftone dot 3a on both sides of the light reflection halftone dot 3a and the base film 2. Is. The shape of each halftone dot of the non-transparent halftone dot portion 3 (light reflection halftone dot 3a, non-transparent halftone dot 3b) is not particularly limited in the present invention. For example, as shown in FIG. It is a halftone dot of a suitable shape such as a round shape, a turtle shell (hexagonal shape, honeycomb) shape, or a square shape.

  In addition, as shown in FIG. 2 (c), the light-shielding window film 1 of the present invention has the photovoltaic generation layer 4 provided with the non-transparent halftone dot portion 3 on one surface of the base film 2. In the total pattern formation area larger than the total pattern formation area of the light reflection halftone dots 3a and / or non-transparent halftone dots 3b, a continuous pattern (photovoltaic generation) The layer 4 is formed on a portion where the opaque layer is present and a portion where the light-impermeable layer is not present.

  When the photovoltaic generation layer 4 is a non-translucent layer and is formed in a continuous pattern on one surface of the base film 2, the photovoltaic generation layer 4 has a non-transparent halftone dot portion. 3 (light reflection halftone dot 3a or / and non-transparent halftone dot 3b) is formed in a continuous pattern with a total formation pattern area larger than the total formation pattern area. Reference numeral 4a denotes a transparent conductive film layer (ITO film), which conducts the pattern-like generation layer 4.

  Thus, in the light-shielding window film 1 of the present invention, the formed photovoltaic generation layer 4 may be a translucent layer or a non-translucent layer, but in the case of a translucent layer, As shown in FIG. 2 (a) and FIG. 2 (b), it is formed in a solid shape on one surface of the base film 2, and in the case of a non-translucent layer, as shown in FIG. 2 (c) A pattern is formed on one surface of the film 2.

  As the photovoltaic generation layer 4 laminated on the base film 2 of the light-shielding window film 1 of the present invention, np capable of photovoltaic power generation on a transparent synthetic resin film (polyester film or the like) surface. A translucent or non-translucent film-like photovoltaic sheet composed of a bonded semiconductor cell layer and a positive electrode and a negative electrode made of a transparent conductive film on both sides of the cell layer. Can be used.

  In the light-shielding window film 1 of the present invention, an adhesive layer 5 (a heat-sensitive adhesive layer, a pressure-sensitive adhesive layer) is laminated on the outermost surface on one side or the other side as necessary, The film 1 can be attached to the glass surface of the window inside the window via the adhesive layer 5.

  In the light-shielding window film 1 of the present invention, the light reflection halftone dot 3a and / or the nontransparent halftone dot 3b of the non-translucent halftone dot portion 3 is provided in one layer or two or more layers. ing.

  In the light-shielding window film of the present invention, the surface (external light receiving surface) of the light reflection halftone dot 3a of the light-impermeable halftone dot portion 3 is a light diffusion surface or a smooth mirror surface.

As the base film 2 of the light-shielding window film 1 of the present invention, for example, a transparent or diffusing surface made of synthetic resin such as polyethylene, polystyrene, polyethylene terephthalate resin, acrylic resin, polymethyl methacrylate resin or the like is used. A translucent film or sheet is used.

  As shown in FIGS. 1 and 2 (a) to (c), one surface (front surface or back surface) of the base film 2 is provided with a photovoltaic generation layer 4 capable of photovoltaic power generation in a solid form on the entire surface. ing. A transparent conductive film layer is provided as an electrode of the generation layer 4 on the surface of the photovoltaic generation layer 4 and the base film 2 side of the photovoltaic generation layer 4.

  The photovoltaic generation layer 4 is provided with a large number of regularly non-translucent halftone dot portions 3, and at least the non-translucent halftone dot portions 3 are on the base film 2 side. On the opposite side, a light reflection halftone dot 3a having a light diffusing surface or a smooth mirror surface is provided.

  In addition, as shown in FIG. 2A, the light-shielding window film 1 of the present invention has a photovoltaic generation layer 4 in an appropriate pattern such as a dot pattern on one surface (front surface or back surface) of the base film 2. On the photovoltaic generation layer 4, or on the photovoltaic generation layer 4 and the substrate film 2, from the light reflection halftone dot 3a or / and the non-transparent halftone dot 3b on the light diffusing surface or smooth mirror surface. It is provided with a large number of regularly configured opaque translucent halftone dots 3.

  In the light-shielding window film of the present invention, as a pattern forming method for the opaque translucent dot portion 3 formed on the surface of the base film 2, there are a photolithography method and a photoresist method. There is a manufacturing method according to the following process.

<Example 1>
For example, as a pattern forming method of the light-impermeable halftone dot portion 3 of the light-shielding window film 1 shown in FIGS. 2 (a) and 3 (a), a smooth surface of the base film 2 (transparent to translucent) is used. Alternatively, a photo-curing type (photo-polymerization type, radiation-polymerization type) photosensitive resin layer is uniformly formed on the photovoltaic generation layer 4 (its electrode), which is laminated on the entire surface with a light diffusion surface. After coating smoothly, the surface of the photosensitive resin layer is regularly arranged at predetermined intervals in the vertical and horizontal directions, and a large number of plains arranged with gaps in each halftone dot (each pattern). A reticulated halftone dot pattern (negative pattern) is exposed to cure the exposed portion.

  Next, a metal-deposited thin film is deposited on the surface of the photosensitive resin layer by a vacuum deposition method using a metal material such as brass, copper, or aluminum as a deposition target to form a light-reflective surface by the metal-deposited thin film. In this case, the metal-deposited thin film is sandblasted on the light-reflecting surface of the metal-deposited thin film when a light-reflecting halftone dot 3a constituting a light-transmitting halftone dot portion 3 described later is used as a light diffusion surface. Form fine irregularities such as satin or grain.

  Thereafter, the photosensitive resin layer was developed with an organic solvent (a solvent that does not dissolve the cured photosensitive resin layer), thereby curing the exposed portion (halftone dot portion) to be the non-transparent halftone dot portion 3. The uncured (unpolymerized) photosensitive resin layer in the unexposed area other than the photosensitive resin layer is removed, and the surface of the cured halftone dot part of the photosensitive resin layer is mirror-like or light consisting of a metal-deposited thin film layer. A two-layer opaque translucent dot portion 3 having a diffused light reflecting halftone dot 3a is formed to form a solid-surface photovoltaic generation layer 4 and a patterned opaque translucent dot portion 3. The film 1 for light-shielding windows of this invention provided with this is formed.

  Thereafter, an adhesive (a heat-sensitive adhesive or a pressure-sensitive adhesive (pressure-sensitive adhesive)) is applied to the entire surface of the base film 2 from above the light-reflecting halftone dot 3a of the non-transparent halftone dot portion 3 as necessary. The film 1 is applied to form an adhesive layer 5 to be described later, and the film 1 can be attached to the glass surface of the window inside the window via the adhesive layer 5. Alternatively, an adhesive is applied to the entire surface of the base film 2 on the side opposite to the side where the light-opaque halftone dot 3 is formed, and an adhesive layer 5 is laminated and formed on the outside of the window through the adhesive layer 5. You may affix the film 1 on the glass surface of a window part.

  2 (a) and 3 (a), the base film 2 surface side having the smooth surface of the light reflection halftone dot 3a of the non-transparent halftone dot portion 3 formed by the metal vapor deposited thin film layer is It becomes a mirror-like light reflection halftone dot 3c, and the surface of the base film 2 having the light scattering face 2a becomes a light scattering light reflection halftone dot 3c (light diffusion).

  FIG. 3B shows the same manner as in Example 1 except that the photovoltaic generation layer 4 formed on one surface of the base film 2 in Example 1 is formed on the other surface of the base film 2. It is the formed light-shielding window film of the present invention.

<Example 2>
As a pattern forming method for the opaque net portion 3 of the light-shielding window film 1 shown in FIGS. 2B and 3C, the smooth surface or light of the base film 2 (transparent to translucent) is used. Uniform thickness using photo-curing type (photo-polymerization type, radiation-polymerization type) photosensitive resin on the photovoltaic generation layer 4 (its electrode) laminated on the entire surface of the diffusion surface. After a smooth coating, a photosensitive resin layer is formed, and the surface of the photosensitive resin layer is regularly spaced at predetermined intervals in the vertical and horizontal directions, and gaps are arranged at each halftone dot (each pattern). A plurality of plain mesh-like halftone dot patterns (negative patterns) arranged in this manner are exposed, the exposed area is polymerized and cured, and the unexposed area (uncured area) is removed with a developer (organic solvent). An opaque net 3b is formed on the back surface of the film 2.

  Next, after a photodegradable photosensitive resin layer is smoothly applied and formed on one surface of the substrate film 2 (transparent to translucent) to a uniform thickness, the surface of the photosensitive resin layer is regularly vertically aligned. A large number of solid halftone dot patterns (positive patterns) arranged in the horizontal direction are exposed to photodecompose an exposed portion that is an area other than the light reflection halftone dot 3a of the non-transparent halftone dot portion 3.

  Next, by developing the photosensitive resin layer, the photodecomposed photosensitivity of the exposed portion (halftone dot portion) which becomes the non-transparent halftone dot portion 3 other than the undecomposed photosensitive resin layer of the unexposed portion. The resin layer is developed and removed with a developing solution (alkaline developing solution), and the base film 2 is exposed to an exposed portion (halftone dot portion) that becomes the light reflection halftone dot 3a.

  Next, from the undecomposed photosensitive resin layer remaining on the surface of the base film 2 after development, a metal deposition thin film is formed by vacuum deposition using a metal material such as brass, copper, or aluminum as a deposition target. A light-reflective surface is formed by vapor deposition, and a light-reflective halftone dot 3a composed of a non-light-transmitting metal vapor-deposited thin film layer is formed on the surface of the base film 2 in the exposed portion (halftone dot portion). At this time, when a light reflection halftone dot 3a to be described later is used as a light diffusing surface, fine irregularities such as a satin shape and a grain shape are formed on the light reflective surface by the metal vapor deposited thin film by a sandblast method or the like. .

  Thereafter, the undecomposed photosensitive resin layer in the unexposed area is dissolved and removed with an organic solvent (solvent that dissolves the photosensitive resin layer), so that a mirror-like or light diffusing light reflection made of a metal-deposited thin film layer is obtained. A light-shielding window film having a light-transmitting halftone dot portion 3 in which a halftone dot 3a is formed, and a light reflection halftone dot 3a and a light reflection halftone dot 3a are provided at opposite positions with the base film 2 interposed therebetween. 1 is formed.

  After that, as necessary, from the light reflection halftone dot 3a of the non-transparent halftone dot part 3 over the entire surface of the base film 2 or from the light nontransparent halftone dot 3b of the nontransparent halftone dot part 3. By applying an adhesive (heat-sensitive adhesive or pressure-sensitive adhesive (adhesive)) on the entire surface of the base film 2 and laminating the adhesive layer 4, FIG. 2 (b) or 3 ( The light-shielding window film 1 of the present invention having the light-reflective halftone dots 3a and 3b on the light-opaque halftone dots 3 as shown in c) is formed.

<Example 3>
As a pattern forming method of the light-impermeable halftone dot portion 3 of the light-shielding window film 1 shown in FIGS. 2 (c) and 3 (d), the smooth surface or light of the base film 2 (transparent to translucent) is used. A photo-curing type (photopolymerization type, radiation polymerization type) photosensitive resin layer is formed on the photovoltaic generation layer 4 (at least the electrode thereof is a continuous conduction pattern) laminated in a pattern on one surface having a diffusion surface. A pattern having an area smaller than the formation pattern area of the photovoltaic generation layer 4 capable of photovoltaic power generation formed in a continuous pattern on the surface of the photosensitive resin layer after being applied smoothly to a uniform thickness A large number of plain halftone dot patterns (negative patterns, non-translucent patterns) arranged at regular intervals in the vertical and horizontal directions and arranged with a gap between each halftone dot (each pattern). Pattern for forming a halftone dot portion 3) and exposing the exposed portion To reduction. 2C and 3D, reference numeral 4a denotes a portion where the pattern of the generation layer 4 in the photovoltaic generation layer 4 formed in a continuous pattern is not present.

  Next, a metal-deposited thin film is deposited on the surface of the photosensitive resin layer by a vacuum deposition method using a metal material such as brass, copper, or aluminum as a deposition target to form a light-reflective surface by the metal-deposited thin film. At this time, when the light reflection halftone dot 3a described later is used as a light diffusing surface, this metal vapor-deposited thin film has a satin-like shape, a grain-like shape or the like on the light-reflective surface of the metal vapor-deposited thin film by a sandblast method or the like Forms fine irregularities.

  Thereafter, the photosensitive resin layer was developed with an organic solvent (a solvent that does not dissolve the cured photosensitive resin layer), thereby curing the exposed portion (halftone dot portion) to be the non-transparent halftone dot portion 3. The uncured (unpolymerized) photosensitive resin layer in the unexposed area other than the photosensitive resin layer is removed, and the surface of the cured halftone dot part of the photosensitive resin layer is mirror-like or light consisting of a metal-deposited thin film layer. A two-layer opaque translucent dot portion 3 having a diffused light reflection halftone dot 3a is formed, and a photovoltaic generation layer 4 as shown in FIGS. 2 (c) and 3 (d) is formed. The light-shielding window film 1 of the present invention having the light-transmitting halftone dot portion 3 composed of the light reflection halftone dot 3a and the light-opaque halftone dot 3b having a total formation pattern area smaller than the total formation pattern area is formed. The

  In addition, although each formation pattern of the said photovoltaic generation layer 4 and the opaque translucent halftone dot part 3 does not need to be a mutually similar shape, as shown in FIG.2 (c) and FIG.3 (d), The patterns may be similar to each other, and the pattern positions may be aligned with the upper layer and the lower layer, or may not be aligned.

  Thereafter, an adhesive (heat-sensitive adhesive or pressure-sensitive adhesive (pressure-sensitive adhesive)) is applied to the entire surface of the base film 2 from above the light-transmitting halftone dot portion 3 as necessary, and an adhesive described later. The layers are laminated or an adhesive is applied to the entire surface of the base film 2 on the side opposite to the side where the light-transmitting halftone dots 3 are formed, and an adhesive layer described later is laminated.

  The light-shielding window film of the present invention is applied to the indoor or outdoor glass surface of a glass plate such as a window glass or door glass of a residential house or a commercial or industrial building, so that sunlight from the outside to the indoor can be used. The incident light can be shielded to increase the indoor temperature and reduce the greenhouse effect.

  FIG. 4 (a) shows the light-shielding window film 1 of the present invention attached with the light-reflecting surface of the light-reflective halftone dot 3a of the light-transmitting halftone dot 3 facing the glass surface or the resin transparent plate surface 10 side. FIG. 4B is a side sectional view for explaining the attached state, and FIG. 4B shows the light-shielding window film 1 of the present invention, the light reflecting surface of the light reflecting halftone dot 3a being a glass surface or a resin transparent plate. It is a sectional side view explaining the state attached and attached on the opposite side with respect to the surface.

FIG. 5 (a) shows the light-shielding window film 1 of the present invention on the indoor side glass surface or resin-made transparent plate surface 10 side, and the light-reflective halftone dots 3a on the outdoor side. FIG. 2 is a partially enlarged side cross-sectional view showing a state of being bonded to each other through an adhesive layer 4 (for example, a heat-sensitive adhesive layer and a pressure-sensitive adhesive layer), and incident light L from the outside is an opaque network The light is shielded corresponding to the formation area ratio of the point 3 and reflected in the outdoor direction by the light reflection halftone dot 3a. Further, if the light reflection halftone dot 3a of the non-transparent halftone dot 3 is a light diffusion surface (light scattering surface), the light reflected by the light reflection halftone dot 3a is reflected with reduced glare with respect to the outdoor side. To do.

  FIG. 5 (b) shows the light reflection of the light-shielding halftone dot 3a of the light-shielding halftone dot 3 of the light-shielding window film 1 of the present invention on the glass surface on the outdoor side or the transparent resin plate surface 10 side. It is a partial enlarged side cross-sectional view in a state where the surface is directed to the outdoor side and bonded through an adhesive layer 4 (for example, a heat-sensitive adhesive layer, a pressure-sensitive adhesive layer), and incident light L from the outside is The light-shielding halftone dot 3 is shielded in correspondence with the formation area ratio and reflected by the light reflection halftone dot 3a in the outdoor direction. Further, if the light reflection halftone dot 3a of the non-transparent halftone dot 3 is a light diffusion surface (light scattering surface), the light reflected by the light reflection halftone dot 3a is reflected with reduced glare with respect to the outdoor side. To do.

  As shown in the partial front view of FIG. 6A and the partial side view of FIG. 6B, the light-shielding window film 1 of the present invention has a non-transparent halftone dot portion 3 (light reflection halftone dot 3 a, non-transparent The light halftone dot 3b) may be a regular large number of turtle shell pattern (hexagonal) halftone dots.

  The fineness (fineness) of the light reflecting halftone dots 3a and the nontransparent halftone dots 3b constituting the nontransparent halftone dots 3 of the light shielding window film 1 of the present invention is determined by the nontransparent halftone dots. 3 is a set size of each halftone dot and a translucent area with respect to the total area of the film 1 on which the light-opaque halftone dot portion 3 is formed (a gap area between the light-reflective halftone dots 3a and the non-transparent halftone dots 3b) Is set by the ratio (aperture ratio) occupied by the total area.

DESCRIPTION OF SYMBOLS 1 ... Light-shielding window film 2 ... Transparent or semi-transparent base film 3 ... Non-transparent halftone dot 3a ... Light reflection surface 3b ... Non-transmission halftone dot 3c ... Light reflection surface 4 ... Photovoltaic generation layer 4a ... conductive film layer 5 ... adhesive layer 10 ... glass plate such as window glass (transparent plate)

Claims (8)

  A transparent or translucent substrate film 2 is provided with a photovoltaic generation layer 4 on one surface, and a regular number of opaque films are provided on the photovoltaic generation layer 4 or on the other surface of the substrate film 2. A film for light-shielding windows, comprising a point portion 3 and at least a light-reflecting halftone dot 3 a on the surface of the light-impermeable halftone dot portion 3.   A transparent or translucent substrate film 2 is provided with a photovoltaic generation layer 4 on one surface, and a regular number of opaque films are provided on the photovoltaic generation layer 4 or on the other surface of the substrate film 2. A point portion 3 is provided, and at least the surface of the light-impermeable halftone dot portion 3 is provided with a light reflection halftone dot 3a; A light-shielding window film comprising a halftone dot 3b.   The light-shielding window film according to claim 1 or 2, wherein the photovoltaic generation layer 4 is a light-transmitting layer and is formed in a solid shape on one surface of the base film 2. Sex window film.   The light-shielding window film according to claim 1 or 2, wherein the photovoltaic generation layer 4 is a light-impermeable layer, and the light-transmitting halftone dot portion 3 is formed on one surface of the base film 2. A light-shielding window film characterized by being formed in a continuous pattern with a total formation pattern area larger than the total formation pattern area.   The light shielding window film according to any one of claims 1 to 4, wherein an adhesive layer 5 is laminated on the outermost surface on one side or the other surface side thereof.   The light-shielding window film according to any one of claims 1 to 5, wherein the light-reflecting halftone dot 3a and / or the non-light-transmissive halftone dot 3b are one or two layers. A film for light-shielding windows, which is provided in the above multilayer.   The light-shielding window film according to any one of claims 1 to 6, wherein the light-receiving surface of the light-reflecting halftone dot 3a of the non-transparent halftone dot portion 3 is a light diffusing surface or a smooth mirror surface. A light-shielding window film.   The light-shielding window film according to any one of claims 1 to 7, wherein the light-reflective halftone dot 3a and the light-transmissive halftone dot 3b are turtle shell (regular hexagonal) -shaped nets. A light-shielding window film characterized by being a dot.

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